﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            Class1 name = new Class1() ;
            name.accNum = 38;
            name.useName = 38;
            name.useNum = 3838;
            name.text();
        }
        static void text1()
        {
            //用户输入正方形边长，用*打印出实心正方形。
            //Console.WriteLine("请输入正方形的边长");
            //int num = int.Parse(Console.ReadLine());
            //    for (int i = 0; i < num; i++)
            //    {
            //        for (int j = 0; j < num; j++)
            //        {
            //            Console.Write("* ");
            //        }
            //        Console.WriteLine();
            //    }
            Console.WriteLine("请输入正方形的边长");
            int num = int.Parse(Console.ReadLine());
            string[,] arr = new string[num, num];
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j < arr.GetLength(1); j++)
                {
                    arr[i, j] = "*";
                }
            }
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j < arr.GetLength(1); j++)
                {
                    Console.Write(arr[i, j] + " ");
                }
                Console.WriteLine();
            }
        }
        static void text2()
        {
            //九九乘法表
            string[,] arr = new string[9, 9];
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j <= i; j++)
                {
                    arr[i, j] = (i + 1) + "*" + (j + 1) + "=" + (i + 1) * (j + 1) + "\t";
                }
            }
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j <= i; j++)
                {
                    Console.Write(arr[i, j]);
                }
                Console.WriteLine();
            }

        }
        static void text3()
        {
            //用户输入正方形边长，用*打印出空心正方形。
            Console.WriteLine("请输入正方形的边长");
            int num = int.Parse(Console.ReadLine());
            string[,] arr = new string[num, num];
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j < arr.GetLength(1); j++)
                {
                    if (i == 0 || i == arr.GetLength(0) - 1)
                    {
                        arr[i, j] = "*";
                    }
                    else
                    {
                        if (j == 0 || j == arr.GetLength(1) - 1)
                        {
                            arr[i, j] = "*";
                        }
                        else
                        {
                            arr[i, j] = " ";
                        }
                    }
                }
            }
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j < arr.GetLength(1); j++)
                {
                    Console.Write(arr[i, j]);
                }
                Console.WriteLine();
            }
        }
        static void text4()
        {
            //打印菱形
            Console.WriteLine("请输入菱形的边长（奇数）");
            int a = int.Parse(Console.ReadLine());
            
            string[,] arr = new string[a*2,a*2];
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j < arr.GetLength(1); j++)
                {
                    if (i<=a && j>a-i && j<a+i || a<i && j>i-a && j<=3*a-1-i)
                    {
                        arr[i, j] = "*";
                    }
                    else
                    {
                        arr[i, j] = " ";
                    }
                }
            }
            for (int i = 0; i < arr.GetLength(0); i++)
            {
                for (int j = 0; j < arr.GetLength(1); j++)
                {
                    Console.Write(arr[i, j]);
                }
                Console.WriteLine();
            }
        }
        static void text5()
        {
            //在 Main 方法中创建一个字符串类型的数组，
            //并存入 5 个值，然后将数组中下标是偶数的元素输出。
            string[] arr = { "a", "b", "c", "d", "e" };
            for (int i = 0; i < arr.Length; i++)
            {
                if (i%2==0)
                {
                    Console.WriteLine(arr[i]);
                }
            }
        }
        static void text6()
        {
            //如果一个数组保存元素是有序的（从大到小）
            //向这个数组中插入一个数，使得插入后的数组元素仍然保持有序。
            int [] arr = {10,20,30,40,50 };
            Array.Sort(arr);
            Array.Reverse(arr);
            foreach (var item in arr)
            {
                Console.Write(item+"\t");
            }
            Console.WriteLine();
            int[] ayy = new int[6];
            ayy[5] = 25;
            for (int i = 0; i < 5; i++)
            {
                ayy[i] = arr[i];
            }
            Array.Sort(ayy);
            Array.Reverse(ayy);
            foreach (var item in ayy)
            {
                Console.Write(item + "\t");
            }
        }
        static void text7()
        {
            //杨辉三角

        }
    }
}
    

